The background of the Direct Current Motor can be traced back to the 1830's, when Michael Faraday set to create an experiment to illustrate whether or not a current carrying wire produced a circular magnetic field all around it. Michael Faraday's experiment turned out to be a success; the current carrying wire did produce a circular magnetic field. This discovery often gave Michael Faraday credit for the invention of the electric motor, but in reality it was only a demonstration and was not able to harness this rotary motion for a useful work output. Several scientists since then such as: William Sturgeon and Joseph Henry based their work on Faraday's results from his experiment and theories by the late nineteenth century the design of the Direct Current Motor had become well established. Since then the demand for Direct Current Motor has skyrocketed for industrial applications.

The operation of any Direct Current motor is based on electromagnetism. The Direct Current motor has two terminals, when voltage is applied across these two terminals of the Direct Current motor a proportional speed is outputted to the shaft of the Direct Current motor. Our Direct Current motor consists of two pieces; first we have the Direct Current motor stator which includes the housing, permanent magnets, and brushes and secondly we have the Direct Current motor rotor which consists of the output shaft, windings and commutator. The Direct Current motor stator is the stationary part of the Direct Current motor and the Direct Current motor rotor rotates with respect to the Direct Current motor stator. When power is applied to the Direct Current motor rotor windings the polarity of the winding and stator magnets are misaligned, and the Direct Current motor rotor will rotate until it is almost aligned with the stator magnets. As the Direct Current motor rotors reaches alignment, the brushes in the Direct Current motor move to the next commutator contacts and energize the next winding causing the current to reverse causing the winding and Direct Current motor stator magnets to misalign again, this process repeatedly is what keeps our Direct Current motor rotating.

In a Direct Current motor a carbon brush is a device which conducts current between stationary wires and moving parts. For a Direct Current motor to work the coils of the Direct Current motor rotor must be connected to complete an actual circuit. To do this slip rings are affixed to the shaft of the Direct Current motor, and brushes attached to the rings which will be used to conduct the current. The carbon brush of the Direct Current motor is a critical component of the Direct Current motor but is considered the weak point in the Direct Current motor as well because it is highly susceptible to wear especially when operating outside of operating parameters of the Direct Current motor. Although these carbon brushes of the Direct Current motor are considered a weak point and can wear, they can also be easily replaced with new carbon brushes for the Direct Current motor. Although many people consider carbon brushes in a Direct Current motor to be a "Black Art," they still serve a great purpose when subjected to the proper operating conditions. They tend to yield an excellent life and perform an amazing function for your Direct Current motor.

There are five basic Direct Current motor types; Direct Current shunt mount motor, Direct Current series wound motor, Direct Current compound motor, Direct Current permanent magnet motor, and Direct Current separately excited motor. A Direct Current shunt wound motor will run at constant speed regardless of the load. With a Direct Current series wound motor the speed varies automatically with the load, increasing as the load decreases. This series wound motor is usually limited when heavy power demand is necessary. The Direct Current compound motor is a combination of the Direct Current shunt and Direct Current series wound motors by combining the characteristics of both. These Direct Current compound motors are usually used when severe starting conditions are met and constant speed. Direct Current Permanent magnet motors contain permanent magnets inside, hence the name, which eliminates the need for external field current. This design yields a smaller, lighter, and energy efficient Direct Current motor. Lastly the Direct Current separately excited motor is used for its high torque capability at low speeds which is achieved by separately generating a high stator field current and enough armature voltage to produce the required rotor torque current.

Although the Direct Current motor has been overshadowed by the brushless motor the Direct Current motor is still used in a wide range of applications. Just because we may not see Direct Current motors very often, they really are everywhere ranging from toys to cellular phones to Jacuzzi pumps. Most automatic car windows and automatic seat adjustments are operated by Direct Current motors. The Direct Current motor has been an automotive industry favorite because of their relatively low cost and simple design. Direct Current motors come in all different sizes all with different torque and speed specifications; so whatever your application may be, there most likely is a Direct Current motor that will meet your demands.

A Direct Current Motor consists of two magnets facing the same direction, that surround two coils of wire that reside in the middle of the motor around a rotor. The coils are positioned to face the magnets, causing electricity to flow to them. This generates a magnetic field, which ultimately pushes the coils away from the magnets they are facing, and causes the rotor to turn. The current shuts off at the rotor makes a 180 turn, causing each rotor to face the opposite magnet. As the current turns on again, the electricity flows oppositely, sending another pulse that causes the rotor to turn once again. The brushes that are located within the Direct Current Motor transfer the electricity from the rotor, controlling the motor’s timing; turning it on and off when instructed.

A Direct Current Motor is a relatively inexpensive and simple design. This is a major advantage to the Direct Current Motor, in that it’s initial start-up costs are affordable; in some cases they are even half the price of their brushless counterparts. However due to the high maintenance and moderately short lifespan, the brush Direct Current Motor tends to increase in price over time, because the brushes within the Direct Current Motor are apt to wearing and require replacement.

The life of the brushes, bearings, and gearbox all play a role in the longevity of a brush Direct Current Motor. Most commonly, life expectancies range from 2,000 to 5,000 hrs of operation, although actual service life varies. Direct Current Motor design, operating current, speed, voltage, and other conditions are all contributing factors.

Always ensure the Direct Current Motor, as well as the motor environment is kept clean, preventing the Direct Current Motor from potentially encountering any type of dirt, oils, or debris. All mounting bolts should be kept tight, and the operation of the motor is in accordance with the given instructions on installation.

A Direct Current Motor generally tends to have increased maintenance requirements in comparison to those of AC motors, because many of the motor’s components are constantly coming in contact with one another. Over time, the brushes will wear and will require replacement. Also, the interaction between the commutator and the brushes will cause debris and contaminants to settle within the Direct Current Motor, that require cleaning up after. Most commonly this occurs between the commutator and the shaft of the Direct Current Motor, as well as between the winding and the armature.

The Direct Current Motor is one of the earliest of all electrical motor designs. It is usually the motor of choice for the majority of torque control and variable speed applications. This Tech Tip discusses the advantages and disadvantages of using a Direct Current Motor motor in machinery and processes.

Advantages of the Direct Current Motor
• The Direct Current Motor has a simple construction, therefore requiring a cheap drive design
• Understandable design/technology facilitates in quick application of a Motor
• The design of the Direct Current Motor is quite simple, in that a permanent magnetic field is created in the by either of two means:
• Permanent magnets
• Electro-magnetic windings
• If the field is created by permanent magnets, a Brush DC Motor is said to be a "permanent magnet DC motor" (PMDC). If created by electromagnetic windings, the direct current motor is often said to be a "shunt wound Brush DC motor" (SWDC). Today, because of cost-effectiveness and reliability, the PMDC motor is the motor of choice for applications involving a fractional horsepower Direct Current Motor, as well as most applications up to about 2.0 horsepower.
• Opposing the stator field is the armature field, which is generated by a changing electromagnetic flux coming from windings located on the rotor of the Direct Current Motor. The magnetic poles of the armature field will attempt to line up with the opposite magnetic poles generated by the stator field. Next, the section of the rotor where the electricity enters the rotor windings is called the commutator. The electricity is carried between the Direct Current Motor rotor and the stator by conductive graphite-copper brushes (mounted on the rotor) which contact rings on stator.

Important to Note: If a Brush DC motor suffers a loss of field (if for example, the field power connections are broken), the DC Motor will immediately begin to accelerate to the top speed which the loading will allow. This can result in the motor flying apart if the motor is lightly loaded. The possible loss of field must be accounted for, particularly with a shunt wound DC Motor.

Imagine power is supplied:

A Brush DC Motor rotates toward the pole alignment point. Just as the DC motor would get to this point, the brushes jump across a gap in the stator rings. Momentum carries the direct current motor forward over this gap. When the brushes get to the other side of the gap, they contact the stator rings again and - the polarity of the voltage is reversed in this set of rings! The direct current motor begins accelerating again, to the opposite set of poles. (The momentum has carried the direct current motor past the original pole alignment point.) This continues as the direct current motor rotates. In most DC motors, several sets of windings or permanent magnets are present to smooth out the motion.

THe Brush DC Motoor is simple to control speed

• Simple to control speed - Controlling the speed of a DC motor is simple. The higher the armature voltage, the faster the rotation. This relationship is linear to the direct current motor's maximum speed.
• The maximum armature voltage which corresponds to the rated speed of the direct current motors (these direct current motors are usually given a rated speed and a maximum speed, such as 1750/2000 rpm) are available in certain standard voltages, which roughly increase in conjunction with horsepower.
• The smallest industrial-type direct current motors are rated 90 VDC and 180 VDC. Larger units are rated at 250 VDC and even higher (dependent upon the individual manufacturer).
• Most industrial DC direct current motors operate reliably over a speed range of about 20:1 - down to about 5-7% of base speed. This is much better performance than the comparable AC motor. This fact is in part due to the fact of the mere simplicity of control. However, it is also partly due to the fact that most industrial DC direct current motors were designed with variable speed operations in mind. The addition of heat dissipation features/ devices provided for lower operating speeds of DC direct current motors.

• NOTE: The specialty DC motor is used in mobile applications and are typically rated 12, 24, or 48 VDC. Other tiny direct current motors can be rated as low as 5 VDC. This DC Motor is very popular among hobbyists.

The Brush DC Motor is simple to control torque

• In a DC motor, torque control is also easy to accomplish. Output torque is proportional to current. So, if the current is limited, you have just limited the torque which the direct current motor can achieve.
• This fact makes the DC direct current motor ideal for delicate applications such as textile manufacturing.

Simple and inexpensive drive/control design

The result of this design is that variable speed or variable torque electronics are easy to design and manufacture. Varying the speed of a DC motor requires little more than a large enough potentiometer. In practice, these have been replaced for all but sub-fractional horsepower applications by the SCR and PWM drives (sometimes referred to as controls), which offer relatively precisely control voltage and current. Common drives for a DC direct current motor is available at the low-end of the product offering (up to 2 horsepower). The cost will depend on the accuracy requirement, but many direct current motors can be accompanied with drives ranging from $29.00 - $199.00 USD.

Disadvantages of the Brush DC Motor

• A Brush DC motor can be a bit expensive to produce, in that the raw materials have become more costly in recent year
• A Brush DC motor is less reliable in control at lowest speeds
• A Brush DC motor is physically larger than other motors with the same torque
• A Brush DC motor is much more high maintenance than are brushless motors
• A Brush DC motor becomes vulnerable to dust which decrease

Although the brushless DC motor has recently surpassed the Direct Current Motor because of its longetivity and reliability, theDirect Current Motor is still used in applications everywhere. Most commonly, the Direct Current Motor is found in household applications, but it can also be found being used in the industrial world because of it’s versatility in altering it’s torque to speed ratio.

The Direct Current Motor is particularly a favorite in the automotive industry, because of their simplicity and affordability. Many automotive manufacturers use them for power windows, seats, etc. However, the Direct Current Motor can be found in nearly every industry ranging from computer manufacturing to textiles to toys.

A Direct Current Motor provides precision control of speed, driven by a direct current. Noted for a particularly high ratio of torque to inertia, the Direct Current Motor has the potential to supply three to four times more torque than it’s rated torque. If needed, it can even provide up to five times more than the rated torque, without stalling. A Direct Current Motor consists of six different components: the axle, armature/rotor, commutator, stator, magnets, and brushes. The Direct Current Motor offers stable and continuous current, using rings to power a magnetic drive that operates the motor’s armature. Perhaps one of the earliest used motors, the Direct Current Motor is commonly used because of the ability to vary the speed-torque ratio in almost any way.

The operation of any Brush Motors are based on electromagnetism. The Brush Motors have two terminals, when voltage is applied across these two terminals of the Brush Motors, a proportional speed is outputted to the shaft of Brush Motors. Our Brush Brush Motors consist of two pieces; first we have the Brush Direct Current Motor stator which includes the housing, permanent magnets, and brushes and secondly we have the Brush Direct Current Motor rotor which consists of the output shaft, windings and commutator. The Brush Motor stator is the stationary part of the Brush Motor and the Brush Motor rotor rotates with respect to the Brush Motor stator. When power is applied to the Brush Direct Current Motor rotor windings the polarity of the winding and stator magnets are misaligned, and the Brush Motor rotor will rotate until it is almost aligned with the stator magnets. As the Brush Direct Current Motor rotors reaches alignment, the brushes in Brush Motors move to the next commutator contacts and energize the next winding causing the current to reverse causing the winding and Brush Motor stator magnets to misalign again, this process repeatedly is what keeps our Brush Motors rotating.

Although the Direct Current Motor has been overshadowed by the brushless motor, the Direct Current Motor is still used in a wide range of applications. Just because we may not see the Direct Current Motor very often, it really is everywhere ranging from toys to cellular phones to Jacuzzi pumps. Most automatic car windows and automatic seat adjustments are operated by Direct Current Motors. The Direct Current Motor has been an automotive industry favorite because of their relatively low cost and simple design. The Direct Current Motor comes in all different sizes all with different torque and speed specifications; so whatever your application may be there most likely is a Direct Current Motor that will meet your demands.

The operation of any Direct Current Motor is based on electromagnetism. The Direct Current Motor has two terminals, when voltage is applied across these two terminals of the Direct Current Motor a proportional speed is outputted to the shaft of the Direct Current Motor. Our Direct Current Motor consists of two pieces; first we have the Direct Current Motor stator which includes the housing, permanent magnets, and brushes. Secondly we have the Direct Current Motor rotor which consists of the output shaft, windings and commutator. The Direct Current Motor stator is the stationary part of the Direct Current Motor and the Direct Current Motor rotor rotates with respect to the Direct Current Motor stator. When power is applied to the Direct Current Motor rotor windings the polarity of the winding and stator magnets are misaligned, and the Direct Current Motor rotor will rotate until it is almost aligned with the stator magnets. As the Direct Current Motor rotors reach alignment, the brushes in the Direct Current Motor move to the next commutator contacts and energize the next winding causing the current to reverse causing the winding and Direct Current Motor stator magnets to misalign again, this process repeatedly is what keeps our Direct Current Motor rotating.

In a Direct Current Motor a carbon brush is a device which conducts current between stationary wires and moving parts. For a Direct Current Motor to work, the coils of the Direct Current Motor rotor must be connected to complete an actual circuit. To do this, slip rings are affixed to the shaft of the Direct Current Motor, and brushes attached to the rings which will be used to conduct the current. The carbon brush of the Direct Current Motor is a critical component of the Direct Current Motor but is considered the weak point in the Direct Current Motor as well because it is highly susceptible to wear, especially when operating outside of operating parameters of the Direct Current Motor. Although these carbon brushes of the Direct Current Motor are considered a weak point and can wear, they can also be easily replaced with new carbon brushes for the Direct Current Motor. Although many people consider carbon brushes in a Direct Current Motor to be a Black Art, they still serve a great purpose when subjected to the proper operating conditions. They tend to yield an excellent life and perform an amazing function for your Direct Current Motor.

Armature – the component of the Brush motor that produces power. It can be located on either the stator or the rotor. Brush – mechanism that conducts current in between moving parts and stationary wires. Brushed Compound Direct Current Motor -a combination of the brushed shunt and brushed series wound motors by combining the characteristics of both. Permanent Magnet Direct Current Motor - contain permanent magnets inside, hence the name, which eliminates the need for external field current. This design yields a smaller, lighter, and energy efficient Direct Current Motor. Separately Excited Direct Current Motor - used for its high torque capability at low speeds which is achieved by separately generating a high stator field current and enough armature voltage to produce the required rotor torque current. Series Wound Direct Current Motor - speed varies automatically with the load, increasing as the load decreases Shunt Wound Direct Current Motor - run at constant speed regardless of the load. Commutator – mechanism which reverses the direction of current in certain electric motors. Direct Current – electrical charge constantly flows in the same direction. As opposed to alternating current, where current periodically switches direction. Electrical Power – electric circuits transferring electrical power at a given rate. Overcurrent – can lead to damaging of equipment due to excessive heat produced within a Brush motor. This occurs because a larger amount of electric current is produced through the conductor. Rotor – rotating device in an electric motor which rotates about the Brush motor generating torque among the rotor’s axis. Stator – part of the motor that is stationary. Torque – the ability of a force to rotate a given object about an axis or fulcrum.

The history of the Direct Current Motor can be traced back to the 1830s, when Michael Faraday set to devise an experiment to demonstrate whether or not a current-carrying wire produced a circular magnetic field around it. Michael Faradays experiment turned out to be a success; the current-carrying wire did produce a circular magnetic field. While Michael Faraday is often credited for the invention of the electric motor, his experiment is really just a lab demonstration; as you cant harness it for useful work. Several other scientists such as: Joseph Henry and William Sturgeon based their work on Faradays experiment and theories and by the late nineteenth century the design of Direct Current Motor had become well established. The demand for the Direct Current Motor has skyrocketed since then, as a necessity in industrial applications.

A Direct Current Motor consists of two magnets facing the same direction, that surround two coils of wire that reside in the middle of the motor around a rotor. The coils are positioned to face the magnets, causing electricity to flow to them. This generates a magnetic field, which ultimately pushes the coils away from the magnets they are facing, and causes the rotor to turn. The current shuts off at the rotor makes a 180 turn, causing each rotor to face the opposite magnet. As the current turns on again, the electricity flows oppositely, sending another pulse that causes the rotor to turn once again. The brushes that are located within the Direct Current Motor transfer the electricity from the rotor, controlling the motor’s timing; turning it on and off when instructed.

A Direct Current Motor is a relatively inexpensive and simple design. This is a major advantage to the Direct Current Motor, in that it’s initial start-up costs are affordable; in some cases they are even half the price of their brushless counterparts. However due to the high maintenance and moderately short lifespan, the brush Direct Current Motor tends to increase in price over time, because the brushes within the Direct Current Motor are apt to wearing and require replacement.

The life of the brushes, bearings, and gearbox all play a role in the longevity of a brush Direct Current Motor. Most commonly, life expectancies range from 2,000 to 5,000 hrs of operation, although actual service life varies. Direct Current Motor design, operating current, speed, voltage, and other conditions are all contributing factors.

Always ensure the Direct Current Motor, as well as the motor environment is kept clean, preventing the Direct Current Motor from potentially encountering any type of dirt, oils, or debris. All mounting bolts should be kept tight, and the operation of the motor is in accordance with the given instructions on installation. A Direct Current Motor generally tends to have increased maintenance requirements in comparison to those of AC motors, because many of the motor’s components are constantly coming in contact with one another. Over time, the brushes will wear and will require replacement. Also, the interaction between the commutator and the brushes will cause debris and contaminants to settle within the Direct Current Motor, that require cleaning up after. Most commonly this occurs between the commutator and the shaft of the Direct Current Motor, as well as between the winding and the armature.

The Direct Current Motor is one of the earliest of all electrical motor designs. It is usually the motor of choice for the majority of torque control and variable speed applications. This Tech Tip discusses the advantages and disadvantages of using a Direct Current Motor motor in machinery and processes. Advantages of the Direct Current Motor • The Direct Current Motor has a simple construction, therefore requiring a cheap drive design • Understandable design/technology facilitates in quick application of a Motor. • The design of the Direct Current Motor is quite simple, in that a permanent magnetic field is created in the by either of two means: • Permanent magnets • Electro-magnetic windings • If the field is created by permanent magnets, a Brush DC Motor is said to be a permanent magnet DC motor (PMDC). If created by electromagnetic windings, the direct current motor is often said to be a shunt wound Brush DC motor (SWDC). Today, because of cost-effectiveness and reliability, the PMDC motor is the motor of choice for applications involving a fractional horsepower Direct Current Motor, as well as most applications up to about 2.0 horsepower. • Opposing the stator field is the armature field, which is generated by a changing electromagnetic flux coming from windings located on the rotor of the Direct Current Motor. The magnetic poles of the armature field will attempt to line up with the opposite magnetic poles generated by the stator field. Next, the section of the rotor where the electricity enters the rotor windings is called the commutator. The electricity is carried between the Direct Current Motor rotor and the stator by conductive graphite-copper brushes (mounted on the rotor) which contact rings on stator. Important to Note: If a Brush DC motor suffers a loss of field (if for example, the field power connections are broken), the DC Motor will immediately begin to accelerate to the top speed which the loading will allow. This can result in the motor flying apart if the motor is lightly loaded. The possible loss of field must be accounted for, particularly with a shunt wound DC Motor. Imagine power is supplied: A Brush DC Motor rotates toward the pole alignment point. Just as the DC motor would get to this point, the brushes jump across a gap in the stator rings. Momentum carries the direct current motor forward over this gap. When the brushes get to the other side of the gap, they contact the stator rings again and - the polarity of the voltage is reversed in this set of rings! The direct current motor begins accelerating again, to the opposite set of poles. (The momentum has carried the direct current motor past the original pole alignment point.) This continues as the direct current motor rotates. In most DC motors, several sets of windings or permanent magnets are present to smooth out the motion. THe Brush DC Motoor is simple to control speed • Simple to control speed - Controlling the speed of a DC motor is simple. The higher the armature voltage, the faster the rotation. This relationship is linear to the direct current motors maximum speed. • The maximum armature voltage which corresponds to the rated speed of the direct current motors (these direct current motors are usually given a rated speed and a maximum speed, such as 1750/2000 rpm) are available in certain standard voltages, which roughly increase in conjunction with horsepower. • The smallest industrial-type direct current motors are rated 90 VDC and 180 VDC. Larger units are rated at 250 VDC and even higher (dependent upon the individual manufacturer). • Most industrial DC direct current motors operate reliably over a speed range of about 20:1 - down to about 5-7% of base speed. This is much better performance than the comparable AC motor. This fact is in part due to the fact of the mere simplicity of control. However, it is also partly due to the fact that most industrial DC direct current motors were designed with variable speed operations in mind. The addition of heat dissipation features/ devices provided for lower operating speeds of DC direct current motors. • NOTE: The specialty DC motor is used in mobile applications and are typically rated 12, 24, or 48 VDC. Other tiny direct current motors can be rated as low as 5 VDC. This DC Motor is very popular among hobbyists. The Brush DC Motor is simple to control torque • In a DC motor, torque control is also easy to accomplish. Output torque is proportional to current. So, if the current is limited, you have just limited the torque which the direct current motor can achieve. • This fact makes the DC direct current motor ideal for delicate applications such as textile manufacturing. Simple and inexpensive drive/control design The result of this design is that variable speed or variable torque electronics are easy to design and manufacture. Varying the speed of a DC motor requires little more than a large enough potentiometer. In practice, these have been replaced for all but sub-fractional horsepower applications by the SCR and PWM drives (sometimes referred to as controls), which offer relatively precisely control voltage and current. Common drives for a DC direct current motor is available at the low-end of the product offering (up to 2 horsepower). The cost will depend on the accuracy requirement, but many direct current motors can be accompanied with drives ranging from $29.00 - $199.00 USD. Disadvantages of the Brush DC Motor • A Brush DC motor can be a bit expensive to produce, in that the raw materials have become more costly in recent year • A Brush DC motor is less reliable in control at lowest speeds • A Brush DC motor is physically larger than other motors with the same torque • A Brush DC motor is much more high maintenance than are brushless motors • A Brush DC motor becomes vulnerable to dust which decrease

There are five basic Direct Current Motor types: brushed shunt mount motor, brushed series wound motor, brushed compound motor, brushed permanent magnet motor, and brushed separately excited motor. A brushed shunt wound motor will run at constant speed regardless of the load. With a brushed series wound motor the speed varies automatically with the load, increasing as the load decreases. This series wound motor is usually limited when heavy power demand is necessary. The brushed compound motor is a combination of the brushed shunt and brushed series wound motors by combining the characteristics of both. These brushed compound motors are usually used when severe starting conditions are met at constant speed. Brushed Permanent magnet motors contain permanent magnets inside, hence the name, which eliminates the need for external field current. This design yields a smaller, lighter, and energy efficient Direct Current Motor. Lastly the brushed separately excited motor is used for its high torque capability at low speeds which is achieved by separately generating a high stator field current and enough armature voltage to produce the required rotor torque current.

Although the brushless DC motor has recently surpassed the Direct Current Motor because of its longetivity and reliability, theDirect Current Motor is still used in applications everywhere. Most commonly, the Direct Current Motor is found in household applications, but it can also be found being used in the industrial world because of it’s versatility in altering it’s torque to speed ratio. The Direct Current Motor is particularly a favorite in the automotive industry, because of their simplicity and affordability. Many automotive manufacturers use them for power windows, seats, etc. However, the Direct Current Motor can be found in nearly every industry ranging from computer manufacturing to textiles to toys.

A Direct Current Motor provides precision control of speed, driven by a direct current. Noted for a particularly high ratio of torque to inertia, the Direct Current Motor has the potential to supply three to four times more torque than it’s rated torque. If needed, it can even provide up to five times more than the rated torque, without stalling. A Direct Current Motor consists of six different components: the axle, armature/rotor, commutator, stator, magnets, and brushes. The Direct Current Motor offers stable and continuous current, using rings to power a magnetic drive that operates the motor’s armature. Perhaps one of the earliest used motors, the Direct Current Motor is commonly used because of the ability to vary the speed-torque ratio in almost any way.

Although Brush Direct Current Motors have been overshadowed by the brushless motor, Brush Direct Current Motors are still used in a wide range of applications. Just because we may not see Brush Motors very often, they really are everywhere ranging from toys to cellular phones to Jacuzzi pumps. Most automatic car windows and automatic seat adjustments are operated by Brush Motors. Brush Direct Current Motors have been an automotive industry favorite because of their relatively low cost and simple design. Brush Direct Current Motors come in all different sizes all with different torque and speed specifications; so whatever your application may be there most likely are Brush Direct Current Motors that will meet your demands.

The operation of any Brush Direct Current Motors are based on electromagnetism. The Brush Direct Current Motors have two terminals, when voltage is applied across these two terminals of the Brush Direct Current Motors, a proportional speed is outputted to the shaft of Brush Direct Current Motors. Our Brush Direct Current Motors consist of two pieces; first we have the Brush Direct Current Motor stator which includes the housing, permanent magnets, and brushes and secondly we have the Brush Direct Current Motor rotor which consists of the output shaft, windings and commutator. The Brush Direct Current Motor stator is the stationary part of the Brush Motor and the Brush Direct Current Motor rotor rotates with respect to the Brush Motor stator. When power is applied to the Brush Direct Current Motor rotor windings the polarity of the winding and stator magnets are misaligned, and the Brush Direct Current Motor rotor will rotate until it is almost aligned with the stator magnets. As the Brush Direct Current Motor rotors reaches alignment, the brushes in Brush Direct Current Motors move to the next commutator contacts and energize the next winding causing the current to reverse causing the winding and Brush Motor stator magnets to misalign again, this process repeatedly is what keeps our Brush Direct Current Motors rotating.

Brush Direct Current motors consist of two magnets facing the same direction, that surround two coils of wire that reside in the middle of Direct Current motors around a rotor. The coils are positioned to face the magnets, causing electricity to flow to them. This generates a magnetic field, which ultimately pushes the coils away from the magnets they are facing, and causes the rotor to turn. The current shuts off at the rotor makes a 180 turn, causing each rotor to face the opposite magnet. As the current turns on again, the electricity flows oppositely, sending another pulse that causes the rotor to turn once again. The brushes that are located within Direct Current motors transfer the electricity from the rotor, controlling the motor’s timing; turning it on and off when instructed.

The life of the brushes, bearings, and gearbox all play a role in the longevity of brush Direct Current motors. Most commonly, life expectancies range from 2,000 to 5,000 hrs of operation, although actual service life varies. The design, operating current, speed, voltage, and other conditions of Direct Current Motors are all contributing factors.

Always ensure the Direct Current motors, as well as the motor environment is kept clean, preventing the motor from potentially encountering any type of dirt, oils, or debris. All mounting bolts should be kept tight, and the operation of the motor is in accordance with the given instructions on installation. Direct Current Motors generally tends to have increased maintenance requirements in comparison to those of AC motors, because many of the motor’s components are constantly coming in contact with one another. Over time, the brushes will wear and will require replacement. Also, the interaction between the commutator and the brushes will cause debris and contaminants to settle within Direct Current motors, that require cleaning up after. Most commonly this occurs between the commutator and the shaft of Direct Current motors, as well as between the winding and the armature.

Brushed Direct Current Motors are one of the earliest of all electrical motor designs. It is usually the motor of choice for the majority of torque control and variable speed applications. This Tech Tip discusses the advantages and disadvantages of using Brushed Direct Current motors in machinery and processes. Advantages of Brushed Direct Current Motors • Brushed Direct Current Motors have a simple construction, therefore requiring a cheap drive design • Understandable design/technology facilitates in quick application of Brushed Direct Current Motors. • The design of Brushed Direct Current motors are quite simple, in that a permanent magnetic field is created in the by either of two means: • Permanent magnets • Electro-magnetic windings • If the field is created by permanent magnets, Brushed DC Motors are said to be a permanent magnet DC motor (PMDC). If created by electromagnetic windings, the brush motor is often said to be a shunt wound Brush DC motor (SWDC). Today, because of cost-effectiveness and reliability, the PMDC motor is the motor of choice for applications involving fractional horsepower brushed Direct Current motors, as well as most applications up to about 2.0 horsepower. • Opposing the stator field is the armature field, which is generated by a changing electromagnetic flux coming from windings located on the rotor of Brushed Direct Current motors. The magnetic poles of the armature field will attempt to line up with the opposite magnetic poles generated by the stator field. Next, the section of the rotor where the electricity enters the rotor windings is called the commutator. The electricity is carried between the brush motor rotor and the stator by conductive graphite-copper brushes (mounted on the rotor) which contact rings on stator. Important to Note: If Brushed Direct Current motors suffer a loss of field (if for example, the field power connections are broken), the Brushed Direct Current Motor will immediately begin to accelerate to the top speed which the loading will allow. This can result in the motor flying apart if the motor is lightly loaded. The possible loss of field must be accounted for, particularly with shunt wound Brushed Direct Current Motors. Imagine power is supplied: Brushed Direct Current Motors rotate toward the pole alignment point. Just as Brushed Direct Current motors would get to this point, the brushes jump across a gap in the stator rings. Momentum carries brushed Direct Current motors forward over this gap. When the brushes get to the other side of the gap, they contact the stator rings again and - the polarity of the voltage is reversed in this set of rings! The brush motor begins accelerating again, to the opposite set of poles. (The momentum has carried Brushed Direct Current motors past the original pole alignment point.) This continues as Brushed DC Motors rotate. In most Direct Current motors, several sets of windings or permanent magnets are present to smooth out the motion. Brushed Direct Current Motors are simple to control speed • Simple to control speed - Controlling the speed of Brushed Direct Current motors are simple. The higher the armature voltage, the faster the rotation. This relationship is linear to the brush motors maximum speed. • The maximum armature voltage which corresponds to the rated speed of the brush motors (these brush Direct Current motors are usually given a rated speed and a maximum speed, such as 1750/2000 rpm) are available in certain standard voltages, which roughly increase in conjunction with horsepower. • The smallest industrial-type brush Direct Current motors are rated 90 VDC and 180 VDC. Larger units are rated at 250 VDC and even higher (dependent upon the individual manufacturer). • Most industrial brush Direct Current motors operate reliably over a speed range of about 20:1 - down to about 5-7% of base speed. This is much better performance than the comparable AC motor. This fact is in part due to the fact of the mere simplicity of control. However, it is also partly due to the fact that most industrial DC motors were designed with variable speed operations in mind. The addition of heat dissipation features/ devices provided for lower operating speeds of Direct Current motors. • NOTE: Specialty Brushed Direct Current motors are used in mobile applications and are typically rated 12, 24, or 48 VDC. Other tiny brush motors can be rated as low as 5 VDC. These Brushed Direct Current Motors are very popular among hobbyists. Brushed Direct Current Motors are simple to control torque • In Brushed Direct Current motors, torque control is also easy to accomplish. Output torque is proportional to current. So, if the current is limited, you have just limited the torque which brush Direct Current can achieve. • This fact makes Brushed Direct Current brushs motor ideal for delicate applications such as textile manufacturing. Simple and inexpensive drive/control design The result of this design is that variable speed or variable torque electronics are easy to design and manufacture. Varying the speed of Brushed Direct Current motors requires little more than a large enough potentiometer. In practice, these have been replaced for all but sub-fractional horsepower applications by the SCR and PWM drives (sometimes referred to as controls), which offer relatively precisely control voltage and current. Common drives for a Brushed Direct Current motor is available at the low-end of the product offering (up to 2 horsepower). The cost will depend on the accuracy requirement, but many brush motors can be accompanied with drives ranging from $29.00 - $199.00 USD. Disadvantages of Brushed Direct Current Motors • Brushed Direct Current motors can be a bit expensive to produce, in that the raw materials have become more costly in recent year • Brushed Direct Current motors are less reliable in control at lowest speeds • Brushed Direct Current motors are physically larger than other motors with the same torque • Brushed Direct Current motors are much more high maintenance than are brushless motors • Brushed Direct Current motors become vulnerable to dust which decrease

There are five basic types of Brushed Direct Current Motors: brushed shunt mount motor, brushed series wound motor, brushed compound motor, brushed permanent magnet motor, and brushed separately excited Brushed Direct Current motor. A brushed shunt wound motor will run at constant speed regardless of the load. With series wound Brushed Direct Current motors the speed varies automatically with the load, increasing as the load decreases. This series wound motor is usually limited when heavy power demand is necessary. The compound Brushed Direct Current motors are a combination of the brushed shunt and brushed series wound motors by combining the characteristics of both. Compound Brushed Direct Current motors are usually used when severe starting conditions are met and constant speed. Brushed Permanent magnet motors contain permanent magnets inside, hence the name, which eliminates the need for external field current. This design yields a smaller, lighter, and energy efficient Brushed Direct Current Motors. Lastly the brushed separately excited motor is used for its high torque capability at low speeds which is achieved by separately generating a high stator field current and enough armature voltage to produce the required rotor torque current.

Brushed Direct Current motors provide precision control of speed, driven by a direct current. Noted for a particularly high ratio of torque to inertia, brushed Direct Current motors have the potential to supply three to four times more torque than it’s rated torque. If needed, it can even provide up to five times more than the rated torque, without stalling. Brushed Direct Current motors consist of six different components: the axle, armature/rotor, commutator, stator, magnets, and brushes. Brushed Direct Current motors offer stable and continuous current, using rings to power a magnetic drive that operates the motor’s armature. Perhaps one of the earliest used motors, brushed Direct Current motors are commonly used because of the ability to vary the speed-torque ratio in almost any way.